AS26211 — PROOFPOINT-ASN-US-WEST

AS26211 announces 18 IPv4 prefixes covering 14,592 addresses and 2 IPv6 prefixes.

About this network

The AS handle PROOFPOINT-ASN-US-WEST is held by Proofpoint, Inc.

What it's used for

• The address space carries enterprise cybersecurity infrastructure, evidenced by reverse DNS entries such as mx0a-009e9401.pphosted.com and pod-outbound.proofpoint.com.
• The network announces 14,592 IPv4 addresses across 18 prefixes and 2 IPv6 prefixes, with only 6 observed neighbours, indicating a dedicated corporate estate rather than a transit or access provider.

Notable

• Registrants are predominantly Proofpoint, Inc., with netnames like PROOFPOINT-NET-NORTH-AMERICA and PROOF, though two prefixes (208.56.8.0/22 and 208.56.56.0/22) list Meta Networks Inc as the registrant.
• The address inventory is finely subdivided into multiple /21, /22, /23, and /24 blocks, consistent with site-by-site segmentation for an internal corporate network.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 66.159.227.0/24
• 66.159.240.0/23
• 66.159.248.0/23
• 67.231.144.0/21
• 67.231.158.0/23
• 148.163.132.0/22
• 148.163.144.0/21
• 148.163.156.0/23
• 205.220.160.0/21
• 205.220.168.0/22
• 205.220.186.0/24
• 205.220.190.0/23
• 208.56.8.0/22
• 208.56.16.0/24
• 208.56.56.0/22
• 208.84.65.0/24
• 208.84.66.0/24
• 208.86.202.0/23
• 2620:100:9000::/47
• 2620:100:900c::/47

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC
• AS1299 Arelion Sweden AB
• AS21949 Beanfield Technologies Inc.
• AS32323 Equinix, Inc.
• AS33651 Comcast Cable Communications, LLC

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC
• AS1299 Arelion Sweden AB
• AS21949 Beanfield Technologies Inc.
• AS32323 Equinix, Inc.
• AS33651 Comcast Cable Communications, LLC